<h1>trailing space</h1>
<h2>trailing space</h2>
<h1>leading and trailing space</h1>
<h2>leading and trailing space</h2>
<h1>1 leading space</h1>
<h2>1 leading space</h2>
<h1>3 leading spaces</h1>
<h2>3 leading spaces</h2>
<p>too many leading spaces
==</p>
<p>too many leading spaces
--</p>